There will be some Mistborn and Stormlight talk here, so beware. We've got some WoBs on Hoid, mentioning that he knows where to be thanks to feruchemy. But how though? Feruchemy itself has two things that might do it, storing Luck with Chromium or perhaps mental speed with Zinc. But that seems easy. Let's get really tinfoily with it. Assumptions 1) Hoid has Feruchemical abilties - We have the above report about this, but that's just one source. Nothing confirmed from novels as of yet. 2) Hoid has Allomantic abilities - This is speculation based on the scene in WoR where Shallan see's him putting something in his drink. Not confirmed, but seems like a nod from Brandon. Whether this is from the lerasium, or another means, isn't relevant right now. All the Compounding we know works by storing a trait with Feruchemy, and burning it with Allomancy, and getting a giant boost out of the Feruchemical power (i.e. gold compounding causes massive healing, and atium compouding grants youth). The reverse works (i.e. burning a metal with Allomancy, and storing/enhancing it with Feruchemy to get a massive amount) as confirmed/discussed here. Hoid could be doing that with Electrum to see a massive amount of his personal future, seeing where he will be, and inferring where to go. TL;DR Hoid is reverse compouding electrum to be a super-oracle
EDIT: I posted a reply down below with more info, specifically about Electrum's power. The Ars Arcanum from Alloy of law says "Reveals Your Own Future". In the detailed section, it says "Oracle Mistings burn electrum to see a vision of possible paths their future could take. This is usually limited to a few seconds." This seems again, to be far different from what Vin/Elend were using it for, and could present a large opportunity for use with enough electrum.